From a815e55e88749d60f9729b83dc6b9fc0e9e0569c Mon Sep 17 00:00:00 2001
From: Michael Shilman <shilman@users.noreply.github.com>
Date: Mon, 11 Nov 2019 17:55:09 +0800
Subject: [PATCH] Merge pull request #8773 from
 donaldpipowitch/fix-8294-source-loader

Source-loader: Warn if applied to non-stories file
---
 lib/source-loader/package.json          | 1 +
 lib/source-loader/src/client/preview.js | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/lib/source-loader/package.json b/lib/source-loader/package.json
index 5b540b028346..94c3619fd980 100644
--- a/lib/source-loader/package.json
+++ b/lib/source-loader/package.json
@@ -29,6 +29,7 @@
   },
   "dependencies": {
     "@storybook/addons": "5.2.7",
+    "@storybook/client-logger": "5.2.7",
     "@storybook/router": "5.2.7",
     "core-js": "^3.0.1",
     "estraverse": "^4.2.0",
diff --git a/lib/source-loader/src/client/preview.js b/lib/source-loader/src/client/preview.js
index 7a03d3f576bd..05491f18cf8b 100644
--- a/lib/source-loader/src/client/preview.js
+++ b/lib/source-loader/src/client/preview.js
@@ -1,4 +1,5 @@
 import addons from '@storybook/addons';
+import { logger } from '@storybook/client-logger';
 import { STORY_EVENT_ID } from './events';
 
 const getLocation = (context, locationsMap) => locationsMap[context.id];
@@ -13,6 +14,14 @@ function sendEvent(
   prefix,
   idsToFrameworks
 ) {
+  if (!context || !context.id || !context.kind || !context.story) {
+    logger.warn(
+      '@storybook/source-loader was applied to a file which does not contain a story. Please check your webpack configuration and make sure to apply @storybook/source-loader only to files containg stories. Related file:'
+    );
+    logger.warn(source);
+    return;
+  }
+
   const channel = addons.getChannel();
   const currentLocation = getLocation(context, locationsMap);